Prime Minister Theresa May raised the country’s threat level, indicating another attack may be imminent. Here’s the latest from our reporters on the scene in Manchester and beyond. Check back for updates throughout the day.

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Video

People gathered in the streets in Manchester, England, on Tuesday to honor the victims of a terrorist attack at an Ariana Grande concert the day before.Published OnMay 23, 2017CreditCreditAndrew Testa for The New York Times

• Entertainment venues, standard “soft targets” for terrorists, have increased security measures in recent years, but this bombing highlighted the dangers that still exist along the perimeters of concert arenas.

• In Dakar, the Senegalese capital, our correspondent asked Chinese traders what led them to leave home, and often their families. “I realized that China had lots of stuff and the people here needed stuff, so it was a good match,” one said.

In the News

• John O. Brennan, the former director of the C.I.A., offered the fullest public account yet of how the federal investigation into Russian election meddling began. [The New York Times]

• In Montenegro, two members of the opposition and a medley of Serbian nationalists are among the 14 people standing trial over a reported coup attempt last year. [Politico]

• In Bahrain, the police clashed with supporters of a prominent Shiite cleric facing deportation. At least five people were killed. [Associated Press]

• At least one million people will die in sub-Saharan Africa and elsewhere, researchers warn, if funding cuts proposed by the Trump administration to global public health programs are enacted. [The New York Times]

•The Spanish police arrested a former president of F.C. Barcelona as part of an inquiry into money laundering and kickbacks. [The New York Times]

•A victory by Google software over the world’s best player of Go, the board game, demonstrates how artificial intelligence can increasingly outperform humans. [The New York Times]

Back Story

President Trump is scheduled to visit the Vatican today, where he will meet Francis, a pope who has expressed reservations over some of the president’s policies.

But meeting the leader of the Roman Catholic Church has been a tradition for American presidents, no matter their political differences.

Every United States leader since Dwight Eisenhower, above, has met the pope during his presidency. George W. Bush had six such meetings (with John Paul II and Benedict XVI), and Barack Obama three.

The first sitting American president to meet a pope was Woodrow Wilson, nearly a century ago.

The meeting with Benedict XV on Jan. 4, 1919, came as the president toured Europe after the end of World War I.

The New York Times reported on the historic meeting on its front page:

“The thousands gathered along the streets cheered and waved their hats when the automobile passed,” the report from Rome read, describing Wilson’s cortege. “A continuous shower of flowers fell upon the President, while cries of ‘Viva America!’ rose above the tumult.”

The two leaders conferred for about 20 minutes. From a window overlooking St. Peter’s Square, Wilson then waved his hat to greet the “mass of cheering people.”

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This briefing was prepared for the European morning. We also have briefings timed for the Australian, Asian and American mornings. You can sign up for these and other Times newsletters here.

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